Is it possible to make a custom credits screen?
Custom Credits Screens
Are you talking about making Screens that have the names of people on them?
Only by making them with cutscenes, as far as I know, there's not other way, at the end of the cutscene, just put a win game (flag?).
Oh.
Yup, and as long as you have the Zelda flags, the original credits screen with those 6 or so Japanese guys will scroll by.